package com.geese.filter.rsa;

import sun.misc.BASE64Encoder;

import java.security.MessageDigest;

/**
 * Created by Administrator on 2016/6/26 0026.
 */
public class MD5Util {
    public final static String MD5(String s) {
        char hexDigits[] = {'0', '1', '2', '3', '4',
                '5', '6', '7', '8', '9',
                'A', 'B', 'C', 'D', 'E', 'F'};
        try {
            byte[] btInput = s.getBytes();
            //获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            //使用指定的字节更新摘要
            mdInst.update(btInput);
            //获得密文
            byte[] md = mdInst.digest();
            //把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /*
     * 计算MD5+BASE64
     */
    public static String MD5Base64(String s) {
        if (s == null)
            return null;
        String encodeStr = "";
        byte[] utfBytes = s.getBytes();
        MessageDigest mdTemp;
        try {
            mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(utfBytes);
            byte[] md5Bytes = mdTemp.digest();
            BASE64Encoder b64Encoder = new BASE64Encoder();
            encodeStr = b64Encoder.encode(md5Bytes);
        } catch (Exception e) {
            throw new Error("Failed to generate MD5 : " + e.getMessage());
        }
        return encodeStr;
    }

    public static void main(String[] args) {
        System.out.println(MD5Base64("{\"username\":\"zhangsan\",\"password\":\"aaa333\"}"));
//        System.out.print(MD5Util.MD5("{\"request\":{\"common\":{\"action\":\"wxPubCreateCharge\",\"reqtime\":\"20160627162935\"},\"content\":{\"accessid\":\"0c1b2a837ad71eea4168f9b7f913ecdd\",\"orderno\":\"112111111\",\"appid\":\"app_10b100b29208d382\",\"money\":\"1\",\"goodscode\":\"110\",\"clientip\":\"192.168.2.120\",\"subject\":\"商品标题\",\"body\":\"支付测试\",\"requestType\":\"pay\",\"extra\":{\"openid\":\"oymdiw7v_dNIdwXGsSxRuts56I48\"}}}}"));
    }
}
